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<div class="title">src/ca/uqac/dim/turtledb/RelationCacheIterator.java</div>  </div>
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<a href="_relation_cache_iterator_8java.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-------------------------------------------------------------------------</span>
<a name="l00002"></a>00002 <span class="comment">    Simple distributed database engine</span>
<a name="l00003"></a>00003 <span class="comment">    Copyright (C) 2012  Sylvain Hallé</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This program is free software: you can redistribute it and/or modify</span>
<a name="l00006"></a>00006 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment">    the Free Software Foundation, either version 3 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">    (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">    This program is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00013"></a>00013 <span class="comment">    GNU General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">    You should have received a copy of the GNU General Public License</span>
<a name="l00016"></a>00016 <span class="comment">    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00017"></a>00017 <span class="comment"> -------------------------------------------------------------------------*/</span>
<a name="l00018"></a>00018 <span class="keyword">package </span>ca.uqac.dim.turtledb;
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="keyword">import</span> java.util.Iterator;
<a name="l00021"></a>00021 
<a name="l00022"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html">00022</a> <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html">RelationCacheIterator</a> <span class="keyword">implements</span> <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a>
<a name="l00023"></a>00023 {
<a name="l00024"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a9b5de1deed971c99d8f8ae46a8ef789e">00024</a>   <span class="keyword">protected</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html">Table</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a9b5de1deed971c99d8f8ae46a8ef789e">m_intermediateResult</a>;
<a name="l00025"></a>00025   
<a name="l00026"></a>00026   <span class="keyword">private</span> <span class="keywordtype">boolean</span> m_called;
<a name="l00027"></a>00027   
<a name="l00028"></a>00028   <span class="keyword">private</span> Iterator&lt;Tuple&gt; m_internalIterator;
<a name="l00029"></a>00029   
<a name="l00030"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a3256deadea9e938c24a38e967eb97642">00030</a>   <span class="keyword">public</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a3256deadea9e938c24a38e967eb97642">RelationCacheIterator</a>()
<a name="l00031"></a>00031   {
<a name="l00032"></a>00032     super();
<a name="l00033"></a>00033     m_called = <span class="keyword">false</span>;
<a name="l00034"></a>00034   }
<a name="l00035"></a>00035   
<a name="l00036"></a>00036   @Override
<a name="l00037"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a693bb4aa5fb4646a5acd700f0fdd706d">00037</a>   <span class="keyword">public</span> <span class="keyword">final</span> <span class="keywordtype">boolean</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a693bb4aa5fb4646a5acd700f0fdd706d">hasNext</a>()
<a name="l00038"></a>00038   {
<a name="l00039"></a>00039     <span class="keywordflow">if</span> (!m_called)
<a name="l00040"></a>00040       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a757b76ec3799e2206e7c00c9e47762a2">initialize</a>();
<a name="l00041"></a>00041     <span class="keywordflow">return</span> m_internalIterator.hasNext();
<a name="l00042"></a>00042   }
<a name="l00043"></a>00043   
<a name="l00044"></a>00044   @Override
<a name="l00045"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#ac46233e263947baaad7d1016c8692092">00045</a>   <span class="keyword">public</span> <span class="keyword">final</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#ac46233e263947baaad7d1016c8692092">next</a>()
<a name="l00046"></a>00046   {
<a name="l00047"></a>00047     <span class="keywordflow">if</span> (!m_called)
<a name="l00048"></a>00048       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a757b76ec3799e2206e7c00c9e47762a2">initialize</a>();
<a name="l00049"></a>00049     <span class="keywordflow">return</span> m_internalIterator.next();    
<a name="l00050"></a>00050   }
<a name="l00051"></a>00051   
<a name="l00052"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a757b76ec3799e2206e7c00c9e47762a2">00052</a>   <span class="keyword">protected</span> <span class="keyword">final</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a757b76ec3799e2206e7c00c9e47762a2">initialize</a>()
<a name="l00053"></a>00053   {
<a name="l00054"></a>00054     <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a72b7e89d7446204211f30c745dbc26b0">getIntermediateResult</a>();
<a name="l00055"></a>00055     m_internalIterator = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a9b5de1deed971c99d8f8ae46a8ef789e">m_intermediateResult</a>.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html#a19846d1f280e9a8658a751b5b6e23bf6">tupleIterator</a>();
<a name="l00056"></a>00056     m_called = <span class="keyword">true</span>;  
<a name="l00057"></a>00057   }
<a name="l00058"></a>00058   
<a name="l00059"></a>00059   @Override
<a name="l00060"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a7c7f66888fbea861ccae4c43e291e28a">00060</a>   <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a7c7f66888fbea861ccae4c43e291e28a">reset</a>()
<a name="l00061"></a>00061   {
<a name="l00062"></a>00062     m_internalIterator = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a9b5de1deed971c99d8f8ae46a8ef789e">m_intermediateResult</a>.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html#a19846d1f280e9a8658a751b5b6e23bf6">tupleIterator</a>();
<a name="l00063"></a>00063   }
<a name="l00064"></a>00064   
<a name="l00065"></a>00065   @Override
<a name="l00066"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#ad1beace0f685b3299ffc4747ec8949db">00066</a>   <span class="keyword">public</span> <span class="keyword">final</span> <span class="keywordtype">void</span> <span class="keyword">remove</span>()
<a name="l00067"></a>00067   {
<a name="l00068"></a>00068     <span class="comment">// Unsupported at the moment</span>
<a name="l00069"></a>00069   }
<a name="l00070"></a>00070   
<a name="l00071"></a>00071   <span class="keyword">protected</span> <span class="keyword">abstract</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_cache_iterator.html#a72b7e89d7446204211f30c745dbc26b0">getIntermediateResult</a>();
<a name="l00072"></a>00072 }
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